Functional and structural characteristics of anticancer peptide Pep27 analogues

Dong Gun Lee, Kyung Soo Hahm, Yoonkyung Park, Hai Young Kim, Weon Tae Lee, Sung Chul Lim, Youn Kyung Seo, Cheol Hee Choi

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Background: A secreted peptide Pep27 initiates the cell death program in S. pneumoniae through signal transduction. This study was undertaken to evaluate the relation between the structure and cytotoxic activity of Pep27 and its analogues on cancer cells. Results: Pep27anal2 characterized substituting (2R→W), (4E→W), (11S→W) and (13Q→W) in native Pep27, exhibited greater hydrophobicity and anticancer activity than Pep27 and other analogues. The IC50 values of Pep27anal2 were approximately 10 - 30 μM in a number of cell lines (AML-2, HL-60, Jurkat, MCF-7 and SNU-601). Confocal microscopy showed that Pep27anal2-FITC was localized in the plasma membrane, and then moving from the membrane to subcellular compartments with the initiation of membrane blebbing. Flow cytometric analysis using propidium iodide and Annexin V also revealed that Pep27anal2 induced apoptosis with minor membrane damage. Electron microscopy revealed that Pep27 induced apoptosis in Jurkat cells. The anticancer activity of Pep27anal2 was neither abrogated by pan-caspase inhibitor (Z-VAD-fmk) nor related to cytochrome c release from mitochondria. The 3D solution structures of these two Pep27 peptides revealed that both form a random coil conformation in water; however, they adopted stable α-helical conformations in solutions. Conclusion: The results indicate that Pep27anal2 can penetrate the plasma membrane, and then induce apoptosis in both caspase-and cytochrome c-independent manner. The hydrophobicity of Pep27anal2 appears to play an important role in membrane permeabilization and/or anticancer properties. The structure-functional relationships of these peptides are also discussed. It is proposed that Pep27anal2 is a potential candidate for anticancer therapeutic agents.

Original languageEnglish
Article number21
JournalCancer Cell International
Volume5
DOIs
Publication statusPublished - 2005 Jul 11

Fingerprint

Peptides
Membranes
Apoptosis
Cytochromes c
Hydrophobic and Hydrophilic Interactions
Cell Membrane
Caspase Inhibitors
Jurkat Cells
Propidium
Fluorescein-5-isothiocyanate
Annexin A5
Blister
Caspases
Confocal Microscopy
Antineoplastic Agents
Inhibitory Concentration 50
Signal Transduction
Pneumonia
Electron Microscopy
Mitochondria

All Science Journal Classification (ASJC) codes

  • Oncology
  • Genetics
  • Cancer Research

Cite this

Lee, Dong Gun ; Hahm, Kyung Soo ; Park, Yoonkyung ; Kim, Hai Young ; Lee, Weon Tae ; Lim, Sung Chul ; Seo, Youn Kyung ; Choi, Cheol Hee. / Functional and structural characteristics of anticancer peptide Pep27 analogues. In: Cancer Cell International. 2005 ; Vol. 5.
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abstract = "Background: A secreted peptide Pep27 initiates the cell death program in S. pneumoniae through signal transduction. This study was undertaken to evaluate the relation between the structure and cytotoxic activity of Pep27 and its analogues on cancer cells. Results: Pep27anal2 characterized substituting (2R→W), (4E→W), (11S→W) and (13Q→W) in native Pep27, exhibited greater hydrophobicity and anticancer activity than Pep27 and other analogues. The IC50 values of Pep27anal2 were approximately 10 - 30 μM in a number of cell lines (AML-2, HL-60, Jurkat, MCF-7 and SNU-601). Confocal microscopy showed that Pep27anal2-FITC was localized in the plasma membrane, and then moving from the membrane to subcellular compartments with the initiation of membrane blebbing. Flow cytometric analysis using propidium iodide and Annexin V also revealed that Pep27anal2 induced apoptosis with minor membrane damage. Electron microscopy revealed that Pep27 induced apoptosis in Jurkat cells. The anticancer activity of Pep27anal2 was neither abrogated by pan-caspase inhibitor (Z-VAD-fmk) nor related to cytochrome c release from mitochondria. The 3D solution structures of these two Pep27 peptides revealed that both form a random coil conformation in water; however, they adopted stable α-helical conformations in solutions. Conclusion: The results indicate that Pep27anal2 can penetrate the plasma membrane, and then induce apoptosis in both caspase-and cytochrome c-independent manner. The hydrophobicity of Pep27anal2 appears to play an important role in membrane permeabilization and/or anticancer properties. The structure-functional relationships of these peptides are also discussed. It is proposed that Pep27anal2 is a potential candidate for anticancer therapeutic agents.",
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Functional and structural characteristics of anticancer peptide Pep27 analogues. / Lee, Dong Gun; Hahm, Kyung Soo; Park, Yoonkyung; Kim, Hai Young; Lee, Weon Tae; Lim, Sung Chul; Seo, Youn Kyung; Choi, Cheol Hee.

In: Cancer Cell International, Vol. 5, 21, 11.07.2005.

Research output: Contribution to journalArticle

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T1 - Functional and structural characteristics of anticancer peptide Pep27 analogues

AU - Lee, Dong Gun

AU - Hahm, Kyung Soo

AU - Park, Yoonkyung

AU - Kim, Hai Young

AU - Lee, Weon Tae

AU - Lim, Sung Chul

AU - Seo, Youn Kyung

AU - Choi, Cheol Hee

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N2 - Background: A secreted peptide Pep27 initiates the cell death program in S. pneumoniae through signal transduction. This study was undertaken to evaluate the relation between the structure and cytotoxic activity of Pep27 and its analogues on cancer cells. Results: Pep27anal2 characterized substituting (2R→W), (4E→W), (11S→W) and (13Q→W) in native Pep27, exhibited greater hydrophobicity and anticancer activity than Pep27 and other analogues. The IC50 values of Pep27anal2 were approximately 10 - 30 μM in a number of cell lines (AML-2, HL-60, Jurkat, MCF-7 and SNU-601). Confocal microscopy showed that Pep27anal2-FITC was localized in the plasma membrane, and then moving from the membrane to subcellular compartments with the initiation of membrane blebbing. Flow cytometric analysis using propidium iodide and Annexin V also revealed that Pep27anal2 induced apoptosis with minor membrane damage. Electron microscopy revealed that Pep27 induced apoptosis in Jurkat cells. The anticancer activity of Pep27anal2 was neither abrogated by pan-caspase inhibitor (Z-VAD-fmk) nor related to cytochrome c release from mitochondria. The 3D solution structures of these two Pep27 peptides revealed that both form a random coil conformation in water; however, they adopted stable α-helical conformations in solutions. Conclusion: The results indicate that Pep27anal2 can penetrate the plasma membrane, and then induce apoptosis in both caspase-and cytochrome c-independent manner. The hydrophobicity of Pep27anal2 appears to play an important role in membrane permeabilization and/or anticancer properties. The structure-functional relationships of these peptides are also discussed. It is proposed that Pep27anal2 is a potential candidate for anticancer therapeutic agents.

AB - Background: A secreted peptide Pep27 initiates the cell death program in S. pneumoniae through signal transduction. This study was undertaken to evaluate the relation between the structure and cytotoxic activity of Pep27 and its analogues on cancer cells. Results: Pep27anal2 characterized substituting (2R→W), (4E→W), (11S→W) and (13Q→W) in native Pep27, exhibited greater hydrophobicity and anticancer activity than Pep27 and other analogues. The IC50 values of Pep27anal2 were approximately 10 - 30 μM in a number of cell lines (AML-2, HL-60, Jurkat, MCF-7 and SNU-601). Confocal microscopy showed that Pep27anal2-FITC was localized in the plasma membrane, and then moving from the membrane to subcellular compartments with the initiation of membrane blebbing. Flow cytometric analysis using propidium iodide and Annexin V also revealed that Pep27anal2 induced apoptosis with minor membrane damage. Electron microscopy revealed that Pep27 induced apoptosis in Jurkat cells. The anticancer activity of Pep27anal2 was neither abrogated by pan-caspase inhibitor (Z-VAD-fmk) nor related to cytochrome c release from mitochondria. The 3D solution structures of these two Pep27 peptides revealed that both form a random coil conformation in water; however, they adopted stable α-helical conformations in solutions. Conclusion: The results indicate that Pep27anal2 can penetrate the plasma membrane, and then induce apoptosis in both caspase-and cytochrome c-independent manner. The hydrophobicity of Pep27anal2 appears to play an important role in membrane permeabilization and/or anticancer properties. The structure-functional relationships of these peptides are also discussed. It is proposed that Pep27anal2 is a potential candidate for anticancer therapeutic agents.

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